package cc.ncmqmctool.common

import java.io.File
import java.io.FileInputStream
import java.io.FileOutputStream
import kotlin.experimental.and
import kotlin.experimental.xor

/**
 * core code of dump
 *
 * @author Yeamy0754
 */
object QmcDump {

    private val BUFFER_SIZE = 8192
    private val KEY: ByteArray

    init {
        val ks = shortArrayOf(//
            0x77, 0x48, 0x32, 0x73, 0xDE, 0xF2, 0xC0, 0xC8, 0x95, 0xEC, 0x30, 0xB2, //
            0x51, 0xC3, 0xE1, 0xA0, 0x9E, 0xE6, 0x9D, 0xCF, 0xFA, 0x7F, 0x14, 0xD1, //
            0xCE, 0xB8, 0xDC, 0xC3, 0x4A, 0x67, 0x93, 0xD6, 0x28, 0xC2, 0x91, 0x70, //
            0xCA, 0x8D, 0xA2, 0xA4, 0xF0, 0x08, 0x61, 0x90, 0x7E, 0x6F, 0xA2, 0xE0, //
            0xEB, 0xAE, 0x3E, 0xB6, 0x67, 0xC7, 0x92, 0xF4, 0x91, 0xB5, 0xF6, 0x6C, //
            0x5E, 0x84, 0x40, 0xF7, 0xF3, 0x1B, 0x02, 0x7F, 0xD5, 0xAB, 0x41, 0x89, //
            0x28, 0xF4, 0x25, 0xCC, 0x52, 0x11, 0xAD, 0x43, 0x68, 0xA6, 0x41, 0x8B, //
            0x84, 0xB5, 0xFF, 0x2C, 0x92, 0x4A, 0x26, 0xD8, 0x47, 0x6A, 0x7C, 0x95, //
            0x61, 0xCC, 0xE6, 0xCB, 0xBB, 0x3F, 0x47, 0x58, 0x89, 0x75, 0xC3, 0x75, //
            0xA1, 0xD9, 0xAF, 0xCC, 0x08, 0x73, 0x17, 0xDC, 0xAA, 0x9A, 0xA2, 0x16, //
            0x41, 0xD8, 0xA2, 0x06, 0xC6, 0x8B, 0xFC, 0x66, 0x34, 0x9F, 0xCF, 0x18, //
            0x23, 0xA0, 0x0A, 0x74, 0xE7, 0x2B, 0x27, 0x70, 0x92, 0xE9, 0xAF, 0x37, //
            0xE6, 0x8C, 0xA7, 0xBC, 0x62, 0x65, 0x9C, 0xC2, 0x08, 0xC9, 0x88, 0xB3, //
            0xF3, 0x43, 0xAC, 0x74, 0x2C, 0x0F, 0xD4, 0xAF, 0xA1, 0xC3, 0x01, 0x64, //
            0x95, 0x4E, 0x48, 0x9F, 0xF4, 0x35, 0x78, 0x95, 0x7A, 0x39, 0xD6, 0x6A, //
            0xA0, 0x6D, 0x40, 0xE8, 0x4F, 0xA8, 0xEF, 0x11, 0x1D, 0xF3, 0x1B, 0x3F, //
            0x3F, 0x07, 0xDD, 0x6F, 0x5B, 0x19, 0x30, 0x19, 0xFB, 0xEF, 0x0E, 0x37, //
            0xF0, 0x0E, 0xCD, 0x16, 0x49, 0xFE, 0x53, 0x47, 0x13, 0x1A, 0xBD, 0xA4, //
            0xF1, 0x40, 0x19, 0x60, 0x0E, 0xED, 0x68, 0x09, 0x06, 0x5F, 0x4D, 0xCF, //
            0x3D, 0x1A, 0xFE, 0x20, 0x77, 0xE4, 0xD9, 0xDA, 0xF9, 0xA4, 0x2B, 0x76, //
            0x1C, 0x71, 0xDB, 0x00, 0xBC, 0xFD, 0x0C, 0x6C, 0xA5, 0x47, 0xF7, 0xF6, //
            0x00, 0x79, 0x4A, 0x11
        )
        KEY = ByteArray(ks.size)
        for (i in ks.indices) {
            KEY[i] = (ks[i] and 0xFF).toByte()
        }
    }

    private fun encrypt(offset: Int, buf: ByteArray, len: Int): ByteArray {
        for (i in 0 until len) {
            buf[i] = buf[i] xor mapL(offset + i)
        }
        return buf
    }

    private fun mapL(v: Int): Byte {
        var v = v
        if (v >= 0) {
            if (v > 0x7FFF)
                v %= 0x7FFF
        } else {
            v = 0
        }
        return KEY[v * v + 80923 and 0xFF]
    }

    fun convert(`in`: File?, out: File): Boolean {
        if (`in` == null || `in`.isDirectory || !`in`.exists()) {
            return false
        }
        var fin: FileInputStream? = null
        var fout: FileOutputStream? = null
        try {
            fin = FileInputStream(`in`)
            fout = FileOutputStream(out)
            var offset = 0
            val buf = ByteArray(BUFFER_SIZE)
            while (true) {
                val length = fin.read(buf)
                if (length == -1) {
                    break
                }
                encrypt(offset, buf, length)
                fout.write(buf, 0, length)
                offset += length
            }
            fout.flush()
        } catch (e: Exception) {
            e.printStackTrace()
            return false
        } finally {
            if (fin != null) {
                try {
                    fin.close()
                } catch (e2: Exception) {
                }

            }
            if (fout != null) {
                try {
                    fout.close()
                } catch (e2: Exception) {
                }

            }
        }
        return true
    }

    fun dump(`in`: File, outPath: File): Boolean {
        val name = `in`.name
        val i = name.lastIndexOf('.')
        var base = name.substring(0, i)
        base = base.substringBeforeLast("[")
        val ext = name.substring(i + 1).toLowerCase()
        when (ext) {
            "qmc0", "qmc3" -> return convert(`in`, File(outPath, "$base.mp3"))
            "qmcflac" -> return convert(`in`, File(outPath, "$base.flac"))
            else -> return false
        }
    }

    //	private static void print(byte[] bts) {
    //		StringBuilder sb = new StringBuilder();
    //		for (byte c : bts) {
    //			sb.append("0x").append(Integer.toHexString(c & 0xff)).append(", ");
    //		}
    //		System.out.println(sb.toString());
    //	}

}
